Dynamo-electric machine



H. C. E. JACOBY.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED APR. I9. 1918.

1,3 ,934, Patented Aug. 9,1921.

' '3 SHEETSSHEET I.

H. c'. E. JACOBY.

DYNAMO ELECTRIC MACHINE. APPUCATION FILED APR. L9. L918.

Patented-Aug. 9,1921.

3 SHEETS-SHEET 2.

H. C. E. J'ACOBY. DIYNAMO ELECTRIC MACHINE.

' APPLICAHON FILED APR.19' IQIB. 1,386,934.

. Patented Aug. 9, 1921.

3 SHEETS-SHEET 3.

45 tion on theline I- IFig.'3.

NITED STATES.

HENRY CHARLES EDWARD JACOBY, OF LONDON, ENGLAND.

DYNAMO -ELECTRIC KACHINE.

To allwhom it may concern:

Be it known that I, HENRY CHARLES Enwann J AOOBY a subject of the King.of Great Britain, residing at London, En land, have invented certainnew and usefu Improve ments in D name-Electric 'Machines, of

, which the 0 lowin is a specification;

This invention re ates to improvements in means for cooling dynamoelectric machines, for example motors of the totally inclosed ii aco-pending a plication of Paul A. H. Mossay, Serial 0. 214,441, filedJan. 30th, .1918, it is proposed to circulate the hot in rnal'air of themachine through channels beyondthe field ripheryin contact with themetallic walls of other, channels throughwhich cold fluid, such as airfrom the surrounding atmosphere, is forced, for

the pur se of obtainin an increased cooling sur ace without un ulyincreasing the dimensions ofthe machine so that the output is increasedper' unit of areaand a saving is effected in material and labor in themanufacture of the machine.

According to the machine is surrounde by two or more rings of metal orother heat-conducting-material the rings being spaced apart to formannular chambers which are connected to the interior of the machine andto a supply of cold fluid, such as-cold air, so asto permit.

' of the hot air from the interior of'the machine beingsandwichedbetween one or more 85 layers or annuli of cold fluid. It will beunderstood that the term annular is intended to include chambers whichconform to or substantially surround the machine whether it be ofcircular cross section as most commonly adopted for dynamo electricmachines,or of angular-cross section. 4 In ,the accompa rlying drawingsFigure 1 is. a si e e evation of a totally inclosed-direct current motorpartly insec- Fig.-,2 --is a detail. section on line 11-11 Fi $3. I

Fig. 3 is an end elevation, part of the end cover-being broken away toexpose the inlet openings or cold air.

Figs. 4 and 5 are side sectional elevations of a modified form of casingand portions of end shields'appliedthereto the sections bei taken onlines IV--IV and VV* Figs.

' Figs. 6 and 7 are endelevations respec- Specification of LettersPatent.

together.

resent invention the yoke G and the pole pieces 36 and a rotor PatentedAug. 9, 1921.

Application filed lAprll 19, 1918. Serial No. 229,498.

tively of the portions of casing and end shield separated .and as seenon their adacent faces. a

Figs. 8 and 9 are partial, side sectional elevations illustratingfurther forms of the invention. i

- In the embodiment of the invention in a totally inclosed directcurrent motor. as

shown in Figs. 1 to 3, the motor comprises two end frames-1 and 2,provided with feet 3 and 4 and acasing 6 of magnetic material formingthe yoke or magnet ring, the end frames and the yoke being convenientlycast The yoke is surrounded by two sheet metal rings 42, 43, spacedapart to form annular channels 7 and 10 for the hot internal air of themotor and .cold external, air

respectively. The end frames 1 and '2 each have recesses 40communicating with themtenor of the machine and also with the hot airchannel 7, the latter communication being effected by openings 41. The.end frames land 2 also each have openin 11' forming ducts between holes11 in end s ields 8 an and the cold air channel 10.

The motor has a stator comprising the or armature 44 of any suitableform well known in the art so that no further descripof any suitableform is mounted on the armature shaft 38' for inducing a circulation ofthe internal air, thecourse of which is indicated by the arrows in" fulllines in Fig. 1, a baflle 39 being provided to assist the fan bydirecting the flow of air. A fan 37 of any suitable form is also mountedon the armature shaft outside the end shield 8, but within a cover 15,for the purpose 4 end frame 2 and openings 11 in the end shield ofpropelling cold air through the openings 9. A cover 16 is rovided on theend shield I 9. The courseo the cold air is indicated by the dottedarrows in Fig. 1. The an- 'nular cold air channels 10 are sandwichedbetween the. heated yoke or magnet ring 6 and the hot air channel 7whereas the hot v air channel 7 is adjacent to the coolsurroundingatmosphere,'being separated there from merel .b the conductive metalpartition 43.- T e internal hot air can thus give up its heat to theatmosphere as well as to l so that the heat absorbe the cold air in thechannel 10, which cold air makes direct contact with the yoke or magnetring 6 and carries away heat therefrom. In a modified form the hotinternal air and the cold air may be split into a plurality of layers orstrata for example as indicated by Figs. 4 and 5, in which form thereare two hot air channels 7 two cold air channels 10 and two sets ofopenings 11, 11, and 41, the arrangement being otherwise similar to thathereinbefore described. The cold air and hot air may be circulatedthrough their respective channels in the same or opposite directions thedirection of flow, depending, as is well known in the art, on theinclination of the fan blades in relation to the direction of rotation.

The term dynamo electric machine is used in the general sense adopted inthe art to include generators, motors, motor generators, or motorconverters, or like electrical machines.

In Fig. 9 a magnet ring 6 devoid of flanges is provided with inclinedducts 41 for external air alternating with radial ducts 11 for internalair. The sheet metal rings 42, 43, are slightly curved to form thechannels 10 and 7.

In Fi 8 the end rings 1 and 2 are each provide with separate series ofducts enabling the hot internal air to be passed in series throu h aplurality of annular channels 7, the cold air passing in parallelthrough a plurality of annular channels 10. These ducts are indicated40, 40, 40" and 40, and the internal air passes through these ducts inthe order above given in series with the respective channels 7connecting them. By this means the path of the internal air and the timeit is bein subjected to the cooling action of the col air are rolonged,whereas the cold air passing t rough in parallel passes awaycomparatively quickly l claim 1. An inclosed dynamo electric machinehaving a casing comprising a yoke, a plurality of sheet metal ringssurrounding said yoke, said rings bein spaced from said yoke and fromeach ot er to form separate series of annular channels for cooling fluidand for the internal hot air of the machine, means for circulatin thehot internal air through one series 0 channels and means for passincooling fluid through the other series of c annels, substantially as andfor the purpose hereinbeforeset forth.

2. An inclosed dynamo electric machine having a casin com a yoke, andframes and en shiel sheet metal rings surrounding said yoke, said ringsbeing s aced apart to form annular channels for t e hot internal air ofthe machine and for by it is rapidly cooling fluid, said end frameshaving ducts therein communicating with the interior of the machine andwith the annular channel for hot internal air, and said end shieldshaving ducts communicating with the exterior of the machine and theannular channel for the cooling fluid.

3. An inclosed dynamo electric machine comprising a stator having amagnet yoke, a rotor, sheet metal rings surrounding said yoke, andspaced therefrom and from each other to form channels for the hotinternal air of the machine and for cold external air respectively, saidstator having ducts communicating with the hot air channel and theinterior of the machine, and other ducts communicating withthe cold -airchannel and the exterior of the machine, and two fans one inside themachine and one outside the machine, for inducing circulation of the hotinternal air and external cold air through the respective hot and coldair ducts and channels, substantially as hereinbefore set forth.

4. An inclosed dynamo-electric machine having a casing comprising acylindrical magnetlc element, a plurality of sheet metal members aboutsaid element, said members being spaced from said element and from eachother to form separate series of circumferential channels for coolingfluid and for the internal hot air of the machine,

means for circulating the hot internal air series of channels, oneseries of interior channels for cold air and another series of exteriorchannels for the hot internal air of the machine, said stator having aset of ducts connecting the exterior hot air channels with the interiorofthe machine, and another set of ducts connecting the interior seriesof channels with the exterior of the machine, and two fans, one insidethe ma chine and one outside the machine, the former for inducingcirculation of the hot internal air from the interior of the machinethrough the exterior series of channels, and the other forinducingcirculation of external cold air through the interior series ofchannels, substantially as set forth.

6. An inclosed dynamo-electric machine ferential channels, an interiorseries for cooling fluid and an exterior series for the hot internal airof the machine, means for name to this specification in the presence ofcireulatlng the hot internal air through the two subscribing witnesses.outer series of channels, and means for passing the cooling fluidthrough the interior Camus EDWARD Mcofl 5 series of channels,substantially as and for Witnesses:

the purpose set forth. A. W. MA'rnYs,

In testimony whereof I have signed my G. I. BRIDGES.

